mirror of
https://github.com/systemd/systemd.git
synced 2026-08-07 00:21:01 +00:00
udevcontrol: allow to set global variables in udevd
The initial patch is from Harald, possible new bugs are from me.
This commit is contained in:
Harald Hoyer
committed by
Kay Sievers
Kay Sievers
parent
01ad1ef5f3
commit
1343a9524f
118
udevcontrol.c
118
udevcontrol.c
@@ -54,9 +54,9 @@ int main(int argc, char *argv[], char *envp[])
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struct sockaddr_un saddr;
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socklen_t addrlen;
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const char *env;
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const char *arg;
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const char *val;
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int *intval;
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int i;
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int retval = 1;
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env = getenv("UDEV_LOG");
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@@ -70,67 +70,73 @@ int main(int argc, char *argv[], char *envp[])
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fprintf(stderr, "missing command\n\n");
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goto exit;
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}
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memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
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strcpy(ctrl_msg.magic, UDEVD_CTRL_MAGIC);
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arg = argv[1];
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for (i = 1 ; i < argc; i++) {
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char *arg = argv[i];
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if (!strcmp(arg, "stop_exec_queue"))
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ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
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else if (!strcmp(arg, "start_exec_queue"))
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ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
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else if (!strcmp(arg, "reload_rules"))
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ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
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else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("log_priority=")];
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ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
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*intval = log_priority(val);
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info("send log_priority=%i", *intval);
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} else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
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char *endp;
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int count;
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if (!strcmp(arg, "stop_exec_queue"))
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ctrl_msg.type = UDEVD_CTRL_STOP_EXEC_QUEUE;
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else if (!strcmp(arg, "start_exec_queue"))
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ctrl_msg.type = UDEVD_CTRL_START_EXEC_QUEUE;
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else if (!strcmp(arg, "reload_rules"))
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ctrl_msg.type = UDEVD_CTRL_RELOAD_RULES;
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else if (!strncmp(arg, "log_priority=", strlen("log_priority="))) {
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("log_priority=")];
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ctrl_msg.type = UDEVD_CTRL_SET_LOG_LEVEL;
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*intval = log_priority(val);
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info("send log_priority=%i", *intval);
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} else if (!strncmp(arg, "max_childs=", strlen("max_childs="))) {
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char *endp;
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int count;
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("max_childs=")];
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ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
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count = strtoul(val, &endp, 0);
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if (endp[0] != '\0' || count < 1) {
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fprintf(stderr, "invalid number\n");
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goto exit;
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}
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*intval = count;
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info("send max_childs=%i", *intval);
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} else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
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char *endp;
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int count;
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("max_childs_running=")];
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ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
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count = strtoul(val, &endp, 0);
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if (endp[0] != '\0' || count < 1) {
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fprintf(stderr, "invalid number\n");
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goto exit;
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}
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*intval = count;
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info("send max_childs_running=%i", *intval);
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} else if (strcmp(arg, "help") == 0 || strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
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printf("Usage: udevcontrol COMMAND\n"
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" log_priority=<level> set the udev log level for the daemon\n"
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" stop_exec_queue keep udevd from executing events, queue only\n"
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" start_exec_queue execute events, flush queue\n"
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" reload_rules reloads the rules files\n"
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" max_childs=<N> maximum number of childs\n"
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" max_childs_running=<N> maximum number of childs running at the same time\n"
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" help print this help text\n\n");
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goto exit;
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} else {
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fprintf(stderr, "unrecognized command '%s'\n", arg);
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("max_childs=")];
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ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS;
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count = strtoul(val, &endp, 0);
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if (endp[0] != '\0' || count < 1) {
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fprintf(stderr, "invalid number\n");
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goto exit;
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}
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*intval = count;
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info("send max_childs=%i", *intval);
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} else if (!strncmp(arg, "max_childs_running=", strlen("max_childs_running="))) {
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char *endp;
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int count;
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intval = (int *) ctrl_msg.buf;
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val = &arg[strlen("max_childs_running=")];
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ctrl_msg.type = UDEVD_CTRL_SET_MAX_CHILDS_RUNNING;
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count = strtoul(val, &endp, 0);
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if (endp[0] != '\0' || count < 1) {
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fprintf(stderr, "invalid number\n");
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goto exit;
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}
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*intval = count;
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info("send max_childs_running=%i", *intval);
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} else if (!strncmp(arg, "env", strlen("env"))) {
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val = argv[2];
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if (val == NULL) {
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fprintf(stderr, "missing key\n");
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goto exit;
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}
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ctrl_msg.type = UDEVD_CTRL_ENV;
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strlcpy(ctrl_msg.buf, val, sizeof(ctrl_msg.buf));
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info("send env '%s'", val);
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} else if (strcmp(arg, "help") == 0 || strcmp(arg, "--help") == 0 || strcmp(arg, "-h") == 0) {
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printf("Usage: udevcontrol COMMAND\n"
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" log_priority=<level> set the udev log level for the daemon\n"
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" stop_exec_queue keep udevd from executing events, queue only\n"
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" start_exec_queue execute events, flush queue\n"
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" reload_rules reloads the rules files\n"
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" env <var>=<value> set a global environment variable\n"
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" max_childs=<N> maximum number of childs\n"
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" max_childs_running=<N> maximum number of childs running at the same time\n"
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" help print this help text\n\n");
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goto exit;
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} else {
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fprintf(stderr, "unrecognized command '%s'\n", arg);
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goto exit;
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}
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if (getuid() != 0) {
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5
udevd.8
5
udevd.8
@@ -71,6 +71,11 @@ Signal udevd to enable the execution of events.
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Signal udevd to reload the rules from the config.
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.RE
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.PP
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\fBenv \fR\fB\fIvar\fR\fR\fB=\fR\fB\fIvalue\fR\fR
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.RS 4
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Set global variable.
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.RE
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.PP
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\fBmax_childs\fR
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.RS 4
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Set the maximum number of events, udevd will handle at the same time.
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16
udevd.c
16
udevd.c
@@ -667,6 +667,7 @@ static void get_ctrl_msg(void)
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struct ucred *cred;
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char cred_msg[CMSG_SPACE(sizeof(struct ucred))];
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int *intval;
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char *pos;
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memset(&ctrl_msg, 0x00, sizeof(struct udevd_ctrl_msg));
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iov.iov_base = &ctrl_msg;
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@@ -703,6 +704,21 @@ static void get_ctrl_msg(void)
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}
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switch (ctrl_msg.type) {
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case UDEVD_CTRL_ENV:
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pos = strchr(ctrl_msg.buf, '=');
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if (pos == NULL) {
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err("wrong key format '%s'", ctrl_msg.buf);
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break;
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}
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pos[0] = '\0';
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if (pos[1] == '\0') {
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info("udevd message (ENV) received, unset '%s'", ctrl_msg.buf);
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unsetenv(ctrl_msg.buf);
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} else {
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info("udevd message (ENV) received, set '%s=%s'", ctrl_msg.buf, &pos[1]);
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setenv(ctrl_msg.buf, &pos[1], 1);
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}
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break;
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case UDEVD_CTRL_STOP_EXEC_QUEUE:
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info("udevd message (STOP_EXEC_QUEUE) received");
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stop_exec_q = 1;
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1
udevd.h
1
udevd.h
@@ -46,6 +46,7 @@ enum udevd_ctrl_msg_type {
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UDEVD_CTRL_SET_MAX_CHILDS,
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UDEVD_CTRL_SET_MAX_CHILDS_RUNNING,
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UDEVD_CTRL_RELOAD_RULES,
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UDEVD_CTRL_ENV,
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};
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struct udevd_ctrl_msg {
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@@ -104,6 +104,12 @@
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<para>Signal udevd to reload the rules from the config.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>env <replaceable>var</replaceable>=<replaceable>value</replaceable></option></term>
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<listitem>
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<para>Set global variable.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term><option>max_childs</option></term>
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<listitem>
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